NO. 2105. NEW SPECIES OF HYMENOFTERA—ROHWER. 225 



Falls Church, Virginia. Described from one female and one male 

 recorded under Bureau of Entomology Number Hopk. U. S. 9839^^", 

 material collected and reared by Fritz Johansen. This species is a 

 primary parasite on Prionoxystus in chestnut, and judging from the 

 observations so far available, it kills the host larva in the fourth or 

 fifth ins tar. 



Type.—Csit. No. 18310, U.S.N.M. 



Genus SCAMBUS Hartig. 



Epiurus FoRSTER. 

 Iseropns Forster. 



As here used the genus Scambus Hartig has Epiurus Foester and 

 Iseropus Forster as synonyms, no generic differences having been 

 observed between the genotypes, as defined by Viereck, Bull. 83, 

 U. S. National Museum, 1914, of the genera in question. 



SCAMBUS EVETRIVORUS, new species. 



This species may be separated from Scambus hrunneifrons (Viereck) 

 in the shorter first tergite and in having the sides of the propodeum 

 almost without sculpture. It is closely related to Scambus nigri- 

 frons (Viereck) but differs from that species in puncturation and in 

 the relatively longer ovipositor. Scambus pteropliorae (Ashmead) 

 which is also similar has entirely red legs and stronger carinae on the 

 propodeum. 



Female. — Length 7 mm.; length of the ovipositor 5.5 mm. Head 

 highly pohshed, without punctures; the posterior orbits as broad as 

 three-quarters of the cephalo-caudad diameter of the eye ; postocellar 

 fine distinctly longer than the ocellocular line; the intraocellar line 

 subequal with the diameter of the anterior ocellus; third antenna! 

 joint but httle shorter than the fourth and fifth combined; the fifth 

 antennal joint slightly shorter than the fourth; mesoscutum pohshed 

 anteriorly, and laterally with widely separate, setigerous punctures; 

 scutellum polished with a few widely separate, setigerous punctures; 

 suture between the scutum and scutellum not foveolate; sides of the 

 propodeum impunctate except for the setigerous punctures; the dorsal 

 aspect with a few widely separated punctures ; two carinae on the pro- 

 podeum rather poorly defined but extending to the apex of the dorsal 

 aspect ; anterior depression of the first tergi te highly pohshed, sharply 

 defined dorsally by carinae ; dorsal aspect of the first tergite with separ- 

 ate, poorly defined punctures, fii'st tergite about as long as its apical 

 width; the second tergite longer than the third, hardly as long as its 

 apical width; the second and following tergites with distinct, well 

 defined, rather large separate punctures, the punctures becoming 

 sparser and smaller apically; nervellus broken at the middle. Black; 

 81022°— Proc.N.M.vol.49— 15 15 



